试题与答案

为了用注射器抽吸密封在药瓶中的药液,医生先向药液中注入一些空气,这样做的目的是_

题型:填空题

题目:

为了用注射器抽吸密封在药瓶中的药液,医生先向药液中注入一些空气,这样做的目的是______.

答案:

抽吸密封在药瓶中的药液,因为药瓶是密封的,为免瓶内气压不足,故要先向药液中注入一些空气,这样做的目的是增大瓶中药液上方的压强,以便更顺利地“吸”取药液.

故本题答案为:增大瓶中药液上方的压强

试题推荐
题型:补全对话,情景问答

根据所给图示完成对话。

James: Hi, Susan!

Susan: Hi, James!

James: Would you like to    1    ping-pong with me?

Susan: Oh, sorry. I can't. Look! I    2    here.

James: Why not    3    your mother to do it?

Susan: Look, she    4    a cow over there.

James: Where    5     your father?

Susan: He's busy, too. He    6    the boxes of apples to the tractor.

James: Oh, I see. What about your grandma?

Susan: We    7    some chieks. She    8    them.

James: So nobody can play with me.

Susan: It doesn't matter. I    9     that after I finish it.

James: That's great! But when?

Susan: In about an hour.

James: OK. I    10     for you in the playhouse.

1.______ 2.______ 3.______ 4.______ 5.______

6.______ 7.______ 8.______ 9.______ 10.______

查看答案
微信公众账号搜索答案